ID 62929
Title Transcription
ヨシノガワタニ ミマチョウ ナカウエ ノ ドチュウソウ カラ ミイダサレタ コウド ヘンセイガンレキ
Title Alternative
Gravels of high-grade metamorphic rock from the Dochu Formation, Nakaue, Yoshinogawa Valley, East Shikoku, Japan
Author
Nakao, Ken-ichi Tokushima Prefectural Museum
Morie, Takashi Wajiki Junior High School
Keywords
三波川変成岩
土柱層
変成岩礫
ざくろ石角閃岩
点紋角閃岩
Content Type
Departmental Bulletin Paper
Description
A condensed bed of the gravels derived from high-grade metamorphic rocks has firstly found in the lower Pleistocene Dochu Formation, from the Nakaue outcrop, Mima-cho in Tokushima Prefecture. The metamorphic gravels are garnet amphibolite, spotted amphibolite, serpentinite and coase grained piedmontite-quartz schist.
The content of the metamorphic gravels is nearly 10 percent. Comparison with the modern original gravels, based on the mineral composition and rock texture on the slab, the metamorphic gravels were identified with the Sambagawa Metamorphic Rocks. Among them, garnet amphibolite and spotted amphibolite are high-grade metamorphic rocks that the modern distribution is restricted only in the Higashi Akaishi-yama district, central Shikoku, and the amphibolite gravels are rarely found in recent Yoshino-gawa riverbed around the Mima-cho
area. The Nakaue outcrop and gravels of high-grade metamorphic rocks were described, and the provenance of the gravels was discussed with tectonic and geomorphological respects.
Journal Title
徳島大学総合科学部自然科学研究 = Natural Science Research, The University of Tokushima
ISSN
09146385
NCID
AN10065859
Volume
23
Issue
1
Start Page
7
End Page
11
Sort Key
7
Published Date
2009-03-16
EDB ID
FullText File
language
jpn
departments
Science and Technology